Re: Help to identify old Philips valve radio. BIF 571A.
The black ones WILL fail sooner or later as they are molded impregnated paper capacitors, but indeed they won't be as bad on average as the hunts, ero, wima or rifa ones.
That said, it would make sense to replace "that" capacitors on sight, and replace the others only after a bit of troubleshooting - if only to prevent introducing new failures.
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